I'm in the same position as many...
6 Years ago we saw son independent for the first time, at University, 130 miles away... When he graduated he quickly got a job, in Norway... He resigned from that shortly before Christmas last year and is currently traveling the world. Though we are in touch, we don't expect to see him before Christmas. I think his birthday, in July will be the hardest; It will be the first time we've not had him home for it. I miss him... but I'm jealous of what he's doing as well, and wouldn't hold him back... In fact we pushed him slightly when he had doubts about going!